What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?
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What are the main chemical compounds that destroy the ozone layer?
What is the formula of the net primary production?
What are some examples of migratory animals?
What is the typical vegetation of the grasslands?
How does npp relate to the energy pyramids?
Explain how are the grasslands of north america and of south america respectively called?
Define dry mass?
Into which type of energy is the light used in photosynthesis transformed.
What is the respective importance of nitrogen for the living beings?
In the short range what will happen to the levels above and below a population of secondary consumers of a numeric pyramid if a large number of individuals from this population dies?
Is herbivorism a form of predatism?
What is the group of aquatic beings composed of large number of photosynthetic beings?